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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '89dba30a4e2ccfe64b7987538532d8ac2ed5df8d7efcb0adbefb9ec42d4a9507' 
  AND token = 'AHaSlfIFklY2QNFMG8M2t2caUWxCOchSAwfpsiOa9T0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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