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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0c80edf3a02fc37f09aa5ab2f6b7dbf2a184d561254e03101133600e6d5c72c3' 
  AND token = 'enSiOCaihp4o8iY8mH78lKXh+ySVP45xotwEn5DA6V0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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