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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3b24ab45eb52091bebe6c9af325c0efdc06cd77a4aaa44da02350fe73decbedb' 
  AND token = '6+MhGiw3Qsf0WYy0Ej7IC0unNZzxR8i0b9nzpzUYx0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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