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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f9c2cdbc7b7419bb0565e458c44783c35dff032a4edaf497e43252b38fa5b7ad' 
  AND token = 'K59J6R9bcvN9ZSABENEpQVrInnB374RNeWTvIk6A1Us=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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