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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3e6eca0870b96b3a373ce0d373cde7ed4c4f26b91657fa39bc3faf271564255d' 
  AND token = '2O7IbhwKYp7UVvbYvY2RSl7Y6OIPsBAg8Ge+I1946pE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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