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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4810077f96193e7cd15b9945decb31f6d0e56a8e613b7a56645915be1a8e1473' 
  AND token = '1EvhCBaJJERKzjYlxcQ30I9yMQ44iFlabfcZcOIS+lI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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