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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '64baa6650a7eae20d1988afb85bc66cb514aa8e76f2a77dc601a2cd981a77586' 
  AND token = '5xbIRq9NSZl16Q7YWFzlMde5+iUQ0TtjlYlfnFeSzRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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