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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7e98a297fa285b16a565858e23d3d00608464628107a7e7a4e10fb9cb7578b56' 
  AND token = 'b24o4TJN2/rvDw88LPMmads6C7gF0h42y7da4Zp8M78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}