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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cd081c64e61c8006c3f813fe1154f5bda2306768410b559c94b48c9ee2cead07' 
  AND token = '4pvGIqAplMua7v2/V+iKtPeGAXvelb6iRzHgapBlkRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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