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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f43da5d01394c419be03ec9d88e0559b365579cc98b0caca9ef43f1f82dc9c93' 
  AND token = 'zyjsmoG6abNJx1kJ8tZokdT8MPGVeD1IhmRuw9XYX1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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