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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '78db77cd2fe2353f33c7894b04ec63a2146c3e0aac12a933b78d3ffff33d8d72' 
  AND token = 'hycgkR5IqZU+y5hkXqYA9aULYSQuo5v+adu2W2vUKvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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