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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2a509ab0791edb80890dc63d971275e55e1d39111f0e8923b672a57dc70d807e' 
  AND token = '/XGWi5QCvD0teuirHiHDSXtgRhTwDCFB97s5nJm++F0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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