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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'be4d00bb822491f5c7c2ab62a97708ffd7b27e4bc829b4acfec394c38d3a67f3' 
  AND token = 'JajF3RPDSMNc8s8DwlljAq4ZTwIIxjrtE/6653u6Aa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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