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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6f1c1055f42d0ded620145e0c9e788598ac2c7665ebca3b71a73a5a96fca1624' 
  AND token = 'X5JoZuRU9LRYnasn0hDrZno4/f6HO+aH88e72a87oR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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