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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7c021f4d6a02da2512e7be13d8495339ec238c60027c46e227ba7e867eb2715c' 
  AND token = 'lWy70nllHlo8HNwQeC/swJk+z5EcPKmJ4vD0HzT+jRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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