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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3aa083b12ff59937e8012326e4de98d449f8106521148ca5759115e26322011b' 
  AND token = 'qOSF/7ygmE2zgi/HtgRoe28JR/wLp9MITgrHGmELEeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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