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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8886b292ec01cabf9d2c1fcd29fc2c7eaf0661ec6b093274ba161d18a76ab9d7' 
  AND token = 'yT/03Eu18TtxIKk+vdhQIcntnlIMNo7nwFYcHIPBHzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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