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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b2bcaf3c0e53c886fb2aee6a757f629dba010519b03b19cec14840c99a7fb782' 
  AND token = 'wA225fo/9nWs3l32oMuMtvSusyS61n7L74lVyN82p4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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