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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5d00169b3e0124287b4a3b865d57f7520903d74b8b9fee01efd351f18755d454' 
  AND token = 'EnXnHk5dQzc1oP04SOwiQOWEOCX3/caGAyT86T6mBLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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