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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '452c6da1e62b4c51cbabc3f82278f9226cffd721fe0eed99e731c6ec5cffa9fe' 
  AND token = '47CtEnocSEV1M5j4JF01MWhZlzkP/0C+8jKuUQhbmtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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