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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd1181fbbbb90f67804b96e8ae22973e46a10a9392af01ad4c9ba587002603526' 
  AND token = 'cS8jxDDQ7qCs2DVsvJ8Q0wRsriXnHjy52weJInpRL5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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