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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '540557676ea4de5543949e68bff682f4acff0a13cc16ce29eac9e128eccbb34a' 
  AND token = 'nyJ4m3DZviT0hC+tI9nEdQj9fBpu2NAYAbwPAyN4kzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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