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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '44e4d0e1c8a1a8f6b4405f5ce4f1cc1a90c8d8812d2032cad9fda970eb0de396' 
  AND token = 'yCMnLQmKyMlJyIkBa8vh47hIb+IN5S4FARBQQQqI7Hw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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