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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e13928ed8a83c54f5fb482145dc98ea9519cc9048e6080ce6b01e87ba467ed4e' 
  AND token = 'TMSS+MFera4S11bJQhMn3yJS79MhN57FWOcR2XPth0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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