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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6272c0e6859b71b0b1da07fa764f5efeb2bbc4b31be8c6f248008c5de58d504f' 
  AND token = 'Fk3jIebjS75J9FobRRg9lBLOmnLYKB4A3MtVzlyedEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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