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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7c34360bf43b5499673fc85868d7bb986a24a9cc8001e7eaee14d13e1cbd86b1' 
  AND token = '+1VcfHK24yn30XAM3KtEPoOQqKGWhTTu/RQSu7pt8Fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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