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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f4031932d33677365b6046b3535efe15d8c2c2368a718032b1ee4ac20c7d9219' 
  AND token = 'tn0idJgHbo8mCYp17Hn9AmW0LYh2m5wgVUIHh1XJQgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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