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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f2d706e7c6e70c33c01d65b8288d38bfd3a57859a0c31ba6f2ccdbb54a1ed8a3' 
  AND token = '/Xmjm+0FYpv/KH15cVq7Xox1nMZeo6TV1qAgo6VE3lk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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