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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '324f120cce1bc2de500cc27cdc880849e126de35c2cf3a45dd0c0afa30c72499' 
  AND token = '3DkS2Rmu2enngr4f53A36bSNH/Hfn4qGp0QFrvAsNEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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