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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b14522078d6c95fc5477c38163c845320f16048a3959e0010436373ab2676978' 
  AND token = 'q686TGTY2kdIGF4J3UIkcoSnQh4LtuXL1fcb9WmPGb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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