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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f8dbf2954e91017f9df43c39ccd069b198e3ca474cd63885d68e2472770da0c5' 
  AND token = 'GpPRwStUnWiJKTIctV1gxS6KP5lKYSvKkxE7y1Igy04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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