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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '816dd78ca39f66877cab470c7b531b3010f3315c39680eda0253467ab624eddc' 
  AND token = 'p5He9/U5rLXvoXQgWAdR4PJf2CoiDYOOI6XQeJa5CMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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