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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '742cba9e7b994d82c1f1c60f5713b721990d540b608b55da4f40379240105157' 
  AND token = '89/F+kchzcoVNCLBaN9lDn7kknxdUydcRnjZxhMiKTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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