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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '09386bca963317f82fcc8cae4f46cb86fe57dc24118c8b784061341d553e17be' 
  AND token = '4pN4e0S1Or0MA3+UH8ZwBfrIwzMZy5Hfi8ETD/e34LI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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