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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f5eb521c4493763bcd916ef622549c1deaac68ddb27ac773656d55c8c511df24' 
  AND token = 'MQOJBhBZEfv/HHn1cN/ZSyOvs0Wbx0cTmk6yrd9/tCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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