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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5a7e768d1ac6e584150e5f2bbdb7f11fb7ec718ff2824fd2bae7d8fcf248f51a' 
  AND token = 'Ov0wepPjZLoO3+y3/du+olKmiC+O960LGsJy2fNq81Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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