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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '82dc00d7fc9e7bb69873040de9d33fa51407530922c540cd2345500280a2f025' 
  AND token = 'MLSPLgCGwPhh05drdenewp0hymQ5TVmRNyY+YFFGFgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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