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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '823769b08c55a2b4d268149da4007d4e931959510795567bc82ab2f4edeec07e' 
  AND token = 'nR98SLNrjusnvOd4yWV7KCAvwoHgkoeP+bsmAhuTt7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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