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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '36288f5d51e6bd0258f040897e9e49126cac755f8d545fa70e84ae5b66a97e11' 
  AND token = 'pjgE9nZNVDob+PkxwQZTlS2Zb8nVCuDg8lMyK0CDva8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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