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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e19532865c325af4f6972effc9276f4d04bcbfeac11258a163babeda7aaf83ff' 
  AND token = 'foJqdNwlm087M7umLi6Gwv7Zynf34M3KNS61N5Hwg60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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