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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ff4f318f52f4a0f57a6d7440852d2e062cc8bea84c2c3ad99f148f4992f180a4' 
  AND token = 'rkOeKdQoqR5sIv+ECmDtZt975jh9BWjwiqETvt4fzfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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