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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e8974f757d0d5b7b77a313bc90b30efe36a3a3b6731288f0b1080c844ed8973c' 
  AND token = '3CqPQ/1XN23TcfgH/QfBj1k7bAU7bNNjlA0avAksMUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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