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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7117c072ff92cc9eff67c433b793887d0aa1624e2a1b0a53abd21acb4acd7d8a' 
  AND token = 'cFk7dj5wC9k7XOGsmE1x2hB2GSByWoZq17iQEw4tthU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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