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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '03fd8d280860379ca206ecfc615b357d9f348bd25a452511f6c3b59367f0eb20' 
  AND token = 'xbbFtKXXvUOnBGEk08SG0EtZ5s8Pk2g8cwmcsroaRnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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