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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'db56f9eb922da1c6788fc030a0945d6ba66cc51b1c0bf930ba9e79a6d8dd1aa9' 
  AND token = 'G3sPdWrUnFaVePm/n8KwsCra0nxgrewpY6UtCDaYO/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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