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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '56d8d8bd690d7ac46bd9248eba7040575fad8c21cd7f6739ca9fc92adc5f689b' 
  AND token = 'TKV2yi1FTGGyk6L5Vrh+WNjrKlTXGZ9qRTcD2+vrK+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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