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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '58acfb77120a50e22037e6a8864cc816bf818fcf6db550b6d4be826ce4f7ade0' 
  AND token = 'uCR3L4iYyrpQCerfre0q6hDxhTY+UHuDunnQKT50+Nc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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