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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1a364b037a4cc54879274fd07cd69c42ca70e793cb9e8b9fb6dd5e763e75149d' 
  AND token = 'ke5l41CtesPhq219oz61uA5glEUKdCKnY7M7KP4Giwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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