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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e8650005ded9a315972628ac04da7f3df36c66a8cabcb0aa5709ae636aadd3ee' 
  AND token = 'fDM8K0CI16RQ2Ztg/lDr12RPofU5EZ75afnBBxLYd+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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