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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1842e6d7839bfd5da1b3a8879e5296b299fb13fbb2b3910469278c9bf4a1f786' 
  AND token = '5U7c1MQ1/1vbkw2T6/iPOZerjjIY8BAybbTubmKMSfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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