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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3fe9ab3467a9c75697e09c930d00df2d6278972c8475d74fc3541fef40398cde' 
  AND token = 'XNS2/PvwmPuW5ARnthBtKjogfHN9C8I0dMAn8SeAgvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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