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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd923e6956889a56d7cde13a7d269bf0bc4d2cadf834203340e60524e16e1de99' 
  AND token = 'UWrUsxlxbbcf1Lobuo+Z4sQRuXSpaxXcu0a2wr2aqWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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