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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e4ded8966eb739fa984a26b6fcdb97a570042d5ac4f194a8444fd47a15c81c65' 
  AND token = 'KKUgp4RRwz28hmEGACfvEM2tFpyG4edckIK1Hd2NoFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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