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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0e1909211292e6ddc8eacea44018d67800a243c040a2ac4b2f5117eb548806a9' 
  AND token = '6BW5mqj0weXjTSMJbFIl9XNwtz9gbxYqTXFyDlrdfQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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