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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '75bcd02a828f2ba140a0b125d43a36b59913557a50f11387b4ec90ae3a3a4367' 
  AND token = '84bun3ViXLQ0U3Bk/s3J6p7SqSv9xQLTgn2sAnk9iiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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